<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>demo</title>
  </head>
  <body>
    <script type="text/javascript" >
      let arr = [
        {name:'晶哥',age:90},
        {name:'强哥',age:14}
      ]
      console.log('改之前',arr)
      debugger;
      arr[0].name = 'tony'
      console.log('改之后',arr)

    </script>
  </body>
</html>